﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;

namespace GameFrameLibrary
{
    /// <summary>
    /// Follow steps 1a or 1b and then 2 to use this custom control in a XAML file.
    ///
    /// Step 1a) Using this custom control in a XAML file that exists in the current project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:GameFrameLibrary"
    ///
    ///
    /// Step 1b) Using this custom control in a XAML file that exists in a different project.
    /// Add this XmlNamespace attribute to the root element of the markup file where it is 
    /// to be used:
    ///
    ///     xmlns:MyNamespace="clr-namespace:GameFrameLibrary;assembly=GameFrameLibrary"
    ///
    /// You will also need to add a project reference from the project where the XAML file lives
    /// to this project and Rebuild to avoid compilation errors:
    ///
    ///     Right click on the target project in the Solution Explorer and
    ///     "Add Reference"->"Projects"->[Browse to and select this project]
    ///
    ///
    /// Step 2)
    /// Go ahead and use your control in the XAML file.
    ///
    ///     <MyNamespace:BoolenButton/>
    ///
    /// </summary>
    [TemplateVisualState(Name = "Checked", GroupName = "CheckStates")]
    [TemplateVisualState(Name = "Unchecked", GroupName = "CheckStates")]
    public class BoolenButton : Button
    {
        static BoolenButton()
        {
            DefaultStyleKeyProperty.OverrideMetadata(typeof(BoolenButton), new FrameworkPropertyMetadata(typeof(BoolenButton)));
        }

        public bool IsChecked
        {
            get { return (bool)GetValue(IsCheckedProperty); }
            set { SetValue(IsCheckedProperty, value); }
        }

        public readonly static DependencyProperty IsCheckedProperty =
            DependencyProperty.Register("IsChecked", typeof(bool), typeof(BoolenButton), new FrameworkPropertyMetadata(false, OnCheckedChanged));

        private static void OnCheckedChanged(DependencyObject dp, DependencyPropertyChangedEventArgs e)
        {
            ((BoolenButton)dp).OnCheckedChanged(e);
        }

        public virtual void OnCheckedChanged(DependencyPropertyChangedEventArgs e)
        {
            var result = (bool)e.NewValue;
            if (result)
            {
                VisualStateManager.GoToState(this, "Checked", true);

                if (this.Checked != null)
                {
                    this.Checked(this, new RoutedEventArgs());
                }
            }
            else
            {
                VisualStateManager.GoToState(this, "Unchecked", true);

                if (this.Unchecked != null)
                {
                    this.Unchecked(this, new RoutedEventArgs());
                }
            }
        }

        protected override void OnClick()
        {
            //if (this.IsChecked)
            //    this.IsChecked = false;
            //else this.IsChecked = true;

            base.OnClick();
        }

        public event RoutedEventHandler Checked;

        public event RoutedEventHandler Unchecked;

    }
}
